With the un-distributable confhexbin.c file, that provided the essential
function convhexbin(), gone, it is not sensible ito keep the ruins that
do not compile any more.
Thanks to git, the 'pcbitctrl' utility can get resusitated once someone
writes a free convhexbin() routine that is compliant to the unfree one..
Until then: R.I.P.
New toplevel Makefile
added xisdnload, xmonisdn, toplevel config for isdnload
Added new interactive configuration utility using lxdialog.
Some adaptions for existing packages.
Some corrections in man pages.